Camera fragment close button.

res/layout/camera_fragment.xml

@@ -16,4 +16,22 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
 
+    <FrameLayout
+        android:id="@+id/camera_close_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="@dimen/small_spacing"
+        android:padding="@dimen/small_spacing"
+        android:background="@drawable/circle_touch_highlight_background"
+        android:clickable="true"
+        android:focusable="true">
+
+        <ImageView
+            android:layout_width="36dp"
+            android:layout_height="36dp"
+            android:src="@drawable/ic_baseline_clear_24"
+            android:tint="@android:color/white"/>
+
+    </FrameLayout>
+
 </FrameLayout>

src/org/thoughtcrime/securesms/mediasend/Camera1Fragment.java

@@ -27,6 +27,7 @@ import android.view.animation.DecelerateInterpolator;
 import android.view.animation.RotateAnimation;
 import android.widget.Button;
 import android.widget.ImageButton;
+import android.widget.ImageView;
 
 import com.bumptech.glide.load.MultiTransformation;
 import com.bumptech.glide.load.Transformation;
@@ -51,6 +52,7 @@ public class Camera1Fragment extends Fragment implements TextureView.SurfaceText
 
   private TextureView                  cameraPreview;
   private ViewGroup                    controlsContainer;
+  private View                         cameraCloseButton;
   private ImageButton                  flipButton;
   private Button                       captureButton;
   private Camera1Controller            camera;
@@ -95,6 +97,7 @@ public class Camera1Fragment extends Fragment implements TextureView.SurfaceText
 
     cameraPreview     = view.findViewById(R.id.camera_preview);
     controlsContainer = view.findViewById(R.id.camera_controls_container);
+    cameraCloseButton = view.findViewById(R.id.camera_close_button);
 
     onOrientationChanged(getResources().getConfiguration().orientation);
 
@@ -102,6 +105,8 @@ public class Camera1Fragment extends Fragment implements TextureView.SurfaceText
 
     GestureDetector gestureDetector = new GestureDetector(flipGestureListener);
     cameraPreview.setOnTouchListener((v, event) -> gestureDetector.onTouchEvent(event));
+
+    cameraCloseButton.setOnClickListener(v -> requireActivity().onBackPressed());
   }
 
   @Override